Polymerization catalysts with improved ethylene enchainment

A bimodal polyethylene composition having improved ethylene enchainment comprising a high molecular weight polyethylene component and a low molecular weight polyethylene component formed together in a single reactor via a bimodal polymerization catalyst system comprising:

• a non-metallocene olefin polymerization catalyst;
• and
• a zirconocene catalyst of the Formula I:
• wherein R1 is a C1 to C20 alkyl, aryl or aralkyl group, wherein R2 is an C1 to C20 alkyl, aryl or aralkyl group, and wherein R3 is a C1 to C20 alkyl or a hydrogen, wherein each X is independently a halide, C1 to C20 alkyl, aralkyl group or hydrogen, and wherein R3 is a C1 alkyl or a linear C3 alkyl.

A method of producing a bimodal polyethylene having improved ethylene enchainment, the method comprising:

• polymerizing ethylene in a reactor in presence of a bimodal polymerization catalyst system to form the bimodal polyethylene, wherein the bimodal polymerization catalyst comprises:
• a non-metallocene catalyst;
• and
• a zirconocene catalyst of Formula I:
• wherein R1 is a C1 to C20 alkyl, aryl or aralkyl group, wherein R2 is an C1 to C20 alkyl, aryl or aralkyl group, and wherein R3 is a C1 to C20 alkyl or a hydrogen, wherein each X is independently a halide, C1 to C20 alkyl, aralkyl or hydrogen, and wherein R3 is a C1 alkyl or a linear C3 alkyl.